Tailstock for cot applying devices



' Nov. 3, 194:2. B. F. HERR' TAILSTOCK FOR COT APgLYme DEVICES Filed Feb. 8, 1939 Patented Nov. 3, 1942 TAILSTOCK roR co'r APPLYING DEVICES Benjamin F. Herr, Lancaster, Pal, assignor to Armstrong Cork Company, Lancaster, Pa., a corporation of Pennsylvania Application February 8, 1939, 'Serial No. 255,254

Claims.

This invention relates to tailstocks for cot applying devices and, more particularly, to tailstocks for such devices adapted to securely and firmly grip a cork cot to permit an arbor or spindle to be satisfactorily inserted into it.

Cork and cork composition cots are compressible so that it is difficult to properly place them on arbors. Arbors, of course, vary in size to some extent due to inaccuracies in manufacture; frequently, the diameter of an arbor is as much as of an inch greater than the bore of the cot so that when an oversize arbor is forced into a cot, the wall of the cot need be stretched to accommodate it. In the types of tailstocks heretofore used, the cot was so supported thatone side only thereof was free to stretch to accommodate an oversize arbor; upon attempted application of the cot to the arbor, one side Wall only would stretch to accommodate the arbor resulting in jamming the cot, or placing it askew onthe arbor. The desirability of supporting a cot'so that all portions thereof are free to stretch equally in a circumferential direction to accommodate an oversize arbor has long been recognized but heretofore no satisfactory means have been devised to securely support a cot while permitting equal stretching in a circumferential direction to accommodate oversize arbors.

The chief object of this invention is to provide a device which satisfactorily and securely grips a cot for properly positioning on an arborand which permits the cot to stretch or distend equally in a circumferential direction while in supported position to accommodate an arbor having a diameter greater than the bore of the cot. An object of this, invention is to provide an economical, readily operable tailstock for cot applying devices which functions to position a cot during application to an arbor, A further object is to provide a device for applying similar compressive forces circumferentially of a cot to securely hold the cot in position to receive an arbor.

This invention relates totailstocks for cot applying devices comprising, in combination, gripping members forming a cot supporting surface,

said members being movable radially of a supported cot and being immovable axially thereof,

and yielding means for moving said members radially inwardly to securely hold a riot in position to receive an arbor, said members being retractible to permit equal distention in a circumferential direction of the walls of the gripped cot to accommodate oversize arbors.

The attached drawing illustrates a preferred embodiment of my invention, in which:

Figure 1 isa View, partly in section and partly in elevation, of the devicein operable position securely gripping a cot; and

Figure 2 is a sectional view taken on the line II II of Figure 1, serving to illustrate the jaw actuating mechanism.

The tailstock comprises a frame? having a key a 3 adapted to be placed within a keyway in a base 4, theframe 2 being firmly attached to the base 4 by any desired means, such as the bolt 5 (Figure 1) which is fitted through the frame 2 and secured to the base by a block '6 engaging the walls of the keyway therein; A split joint I is provided on one endof the frame 2 for the reception of a stop 8, for a purpose hereinafter explained. The opposite end of the frame 2 is provided with a cylindrical opening within which are placed four gripping members or jaws 9 forming a cot supporting surface. The cot supporting surfaces of the jaws 9 are concave in form and may be provided with threads It! to furnish increased frictional engagement between such surface and a supported cot Il.

The stop 8 is within the jaws 9 adjacent the cot supporting surface formed thereby, and serves to prevent axial moveme'nt of the supported cot ll. The stop 8 may be formed in two sections to permit ready exchange of the cot engaging section to accommodate diiferent sizes of cots. Onesection may consist of a hollow cylindrical tube l2 adapted to fit within the split joint I, provided with a shoulder [3 on the inner side ofCthe tube? wall. Theoppcsite end of the tube l2 may be provided with an opening l4 adapted to receive a handle to aid in releasing the stop 8. The other section consists of a tube It: flaredloutwardly to form a hollow portion extending within the jaws 9 and engaging the supported cot II. the tube l5 fitting within the hollow tube l2 in engagement with the shoulder l3 therein. An opening 16 is provided extending longitudinally through the tube l5 to permit the escape of air; water or lubricant entrapped between the tube I5 and an arbor when the arbor is thrust into the supported cot ll.

A rotatable casing 11 is placed over the end of the frame 2 containing the jaws 9 and is held inposition thereon by a snap-ring l3 fitted in the recess in the frame 2, the ring l8 securely holding the casing l1 and frame 2 in engagement while permitting free rotation of the casing l1 circumferentially of the frame 2. A handle 19 is molded as an integral part of the casing I! to aid in ready movement thereof.

The actuating mechanism for each of the jaws 9 being similar, I will describe it merely in connection with one jaw. The jaw 9 is connected to a plunger 29 having an upper domed flange 2| and terminating in a block 22 fitted within the jaw 9. An eccentric pin 23 extends longitudinally through the jaw 9 and fits into an opening in the block 22, securely holding the jaw 9 and plunger 20 in movable engagement with one another. The plunger 20 extends through an opening in the frame 2, the domed flange 2| extending adjacent the casing I1. Between the frame 2 and the flange 2| is positioned a helical spring 24 surrounding the upper portion of the plunger 20 and being seated in a recess in the frame 2. A cam spring 25 is bolted in predetermined position to the casing I! in engagement with the flange 2| of the plunger 20. Upon rotation ofthe casing II, the spring 25 forces the plunger 2!] and its connected jaw 9 radially inwardly to apply compressive forces to the supported cot ll, compressing the helical spring 24 between the frame 2 and the flange 2|. Upon rotation of the casing I 'l in the opposite direction, the spring 25 is retracted, releasing the plunger 29. The helical spring 24 is thus free to move the plunger 20 and its connected jaw 9 radially outwardly, thereby retracting the jaw 9 and releasing the supported cot l I.

In operation, the stop 8 is positioned within the jaws 9 adjacent the cot supporting surface formed thereby. The cot H is supported by the jaws 9 in engagement with the stop 8 which serves to prevent further axial movement of the cot. The casing I1 is then rotated so that cam springs 25 force the plungers 20 and their connected jaws 9 radially inwardly to apply compressive forces to the supported cot l I to securely hold the same in position to receive an arbor. An arbor is thrust into the cot H, air, water or lubricant entrapped between the inserted arbor and the stop 8 being permitted to escape through the opening IS in the stop. Thereupon, the casing I1 is rotated in the opposite direction, retracting the cam springs 25 thus freeing the plungers 29 and their connected jaws 9 and permitting the helical springs 24 to retract the jaws 9 to release the supported cot H and to permit the arbor and the cot to be withdrawn.

It will be appreciated the application of similar compressive forces about the circumference of the supported cot securely holds the cot in position to receive an arbor, the jaws being retractible to permit equal distention in a circumferential direction of the walls of the gripped cot so as to accommodate an arbor having a diameter greater than the bore of the cot, thereby obviating jamming or improper positioning of a cot on an oversize arbor. In other words, my device satisfactorily grips and positions a cot for application to an arbor whether or not the arbor is of equal or somewhat greater diameter than the bore of the cot.

The term oversize arbor is used herein to denote an arbor having a diameter greater than the bore of the cot to be placed thereover.

While I have described and illustrated a preferred embodiment of my invention, it will be understood that my invention is not so limited since it may be otherwise embodied within the scope of the following claims.

I claim:

1. In a tailstock for cot applying devices, the

combination of a frame, a rotatable casing disposed adjacent said frame, gripping members disposed within said frame forming a cot supporting surface, said members being movable radially of a supported cot and being immovable axially thereof, and cam springs mounted on said casing and actuated by rotation thereof to move said members radially inwardly to securely hold the cot in position to receive an arbor.

2. In a tailstock for cot applying devices, the combination of a frame, a rotatable casing dis posed adjacent said frame, gripping members disposed within said frame forming a cot supporting surface, said members being movable radially of a supported cot and being immovable axially thereof, a stop positioned in spaced relationship to said members to prevent axial movement of a supported cot, plungers mounted in engagement with said members, spring means mounted on said casing and actuated by rotation thereof to move the plungers and their engaged members radially inwardly to securely hold a cot in position to receive an arbor, said members being substantially uniformly retractible while subject to the force of said spring means to permit equal distention in a circumferential direction of the walls of a gripped cot to accommodate oversize arbors, and means surrounding the plunger and held between the tops of the plungers and said frame adapted to retract said plungers and said members to original position upon rotation of said casing in an opposite direction thereby releasing the supported cot.

3. In a tailstock for cot applying devices, the combination of a frame, a rotatable casing disposed adjacent said frame, jaws forming a cot supporting surface, said jaws disposed within said frame being movable radially of a supported cot and being immovable axially thereof, a stop in spaced relationship to said jaws to prevent axial movement of a supported cot, plungers connected to said jaws, cam springs mounted on said casing and actuated by rotation thereof to move said jaws radially inwardly to securely hold the cot in position to receive an arbor, said jaws being substantially uniformly retractible while subject to the force of said cam springs to permit equal distention in a circumferential direction of the walls of the gripped cot to accommodate oversize arbors, and means disposed between the tops of the plungers and the frame adapted to retract said jaws to original position upon rotation of said casing in an opposite direction thereby releasing a supported cot.

4. In a tailstock for cot applying devices, the combination of a frame, a rotatable casing positioned adjacent said frame, gripping members within said frame forming a cot supporting surface, said members being movable radially of a supported cot and being immovable axially thereof, a stop mounted on said frame in spaced relationship to said members to prevent axial movement of a supported cot, a plunger passing through said frame and being movably connected to one of said members, a cam spring mounted on said casing engaging said plunger, rotation of said casing actuating said spring to move said member radially inwardly to securely hold a cot in position to receive an arbor, and a helical spring surrounding said plunger and held between the top of the plunger and said frame, said helical spring being adapted to retract said member to original position upon rotation of said casing in an opposite direction thereby releasing a supported cot.

5. In a tailstock for cot applying devices, the

"combination of a frame having a recess therein, a

rotatable casing positioned in engagement with said frame, a snap ring fitted in said recess preventing disengagement of said casing andsaid frame while permitting rotation of said casing, jaws within said frame cooperating to form a cot supporting surface, a stop mounted on said frame and extending within said jaws in engagement with a supported 1001', to prevent axial movement thereof, and means for moving said jaws radially inwardly to securely hold a not in position to receive an arbor, said means including, in combination with each jaw, a plunger passing through the frame and movably connected to said jaw, a cam spring mounted on said casing movable therewith and engaging said plunger, and a helical spring surrounding said plunger and held between said frame and the top of the plunger, rotation of said casing actuating the cam spring to move said jaw radially inwardly, said helical spring being adapted to retract said jaw upon rotation of the casing in the opposite direction thereby releasing a supported cot.

BENJAMIN F. HERB.

Patent No'. 2,500,918.

" CERTIFICATE OF CORRECTION. v November 5, 19 42.

BENJAMIN F. HERR. Y

It is hereby certified that error appears in the printed specification" of the above numbered pateht requiring correction as follows: Pegs 2, sec- 0nd column, linesj, 57 and 58, claim 5, for "jaws formifigecot ,upporting silrface, .said :jaws disposed within said frame being" read -jbw di's posed withih said frame forming a cot supporting surface, said jhws being-fr;

end that the said. Letters Patent should be read with this correction therev in that the same may conform to the record of the case in the Patent Office.

Signed arid sealed this 29th day of December, A. D; 1%2. v

i v I V Henryvan Arsdale', (Seal). I Acting Commiseioner o f Praten ts. 

